# coding: utf-8

############################################################################
#
#   Copyright (c) 2020  Bresee, Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#############################################################################

"""
other perform 

"""

import collections


class LRUCache(collections.OrderedDict):
    def __init__(self, size=20):
        super().__init__()
        self.size = size,
        self.cache = collections.OrderedDict()

    def get(self, key):
        if key in self.cache:
            val = self.cache.pop(key)
            self.cache[key] = val
        else:
            val = None

        return val

    def set(self, key, val):
        if key in self.cache:
            self.cache.pop(key)
            self.cache[key] = val
        else:
            if len(self.cache) == self.size:
                self.cache.popitem(last=False)
                self.cache[key] = val
            else:
                self.cache[key] = val
